When I ordered mine I asked Jerry about this. He said moving the buckles is the answer for even up to 2 inches or so, without materially affecting the look. More than that and you'd start getting the apron pleat too far forward, it seems. You've moved in the better direction, however, not only for health but because it is easier to mak a too-large kilt smaller than the other way around.

You couldalso try seeling it on the for sale forum if it seems just too big.